Low-cost TiO2/Sb2(S, Se)3 heterojunction thin film solar cell fabricated by sol-gel and chemical bath deposition

Low cost TiO2/ Sb2(S, Se)3 heterojunction thin film solar cell are prepared successfully by using sol-gel and chemical bath deposition. At first, TiO2 thin film is prepared on the ITO-coated glass substrate by a simple sol-gel and dip-coating method. Subsequently, Sb2(S, Se)3 film is fabricated on TiO2 by selenizing the Sb2S3 film prepared by chemical bath deposition (CBD). The heat-treated process of TiO2 and Sb2(S, Se)3 films has been discussed, respectively. After being heat-treated at 550 °C for TiO2 and 290 °C for Sb2(S, Se)3 films, the photovoltaic devices are completed with the conductive graphite as electrode. The J-V characteristics of TiO2/ Sb2(S, Se)3 solar cell are measured and the open circuit voltage (Voc) of this cell is about 350 mV.